@syee - Welcome to the community. Unfortunately there is no way at this time to export data from burndown charts. If you have ScriptRunner I believe you can use the following to get the information you are after.
issuefunction in addedAfterSprintStart(board-name, [sprint-name])
issuefunction in removedAfterSprintStart(board-name, [sprint-name])
Hi @syee -- Welcome to the Atlassian Community!
You have two questions, with some overlap between them.
1) Is there a possibility to extract data from a burndown chart?
No, but you can pull the Sprint Report as JSON for a completed sprint using the REST API, substituting in yourCompanyInstanceURL, yourBoardNumber, and yourSprintNumber
2) I've been trying to create a filter with all the "scope change" tickets but haven't had success.
This is not possible with out-of-the-box Jira JQL. If you have one of the marketplace scripting or reporting addons, several have features to support this. For example, ScriptRunner.
Without a marketplace add-on, there are a few work-arounds:
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